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Going fast purposes? In truth, non-specific purposes.
I guess I'm looking for a general rule here, or for examples where metal bikes would be a justified choice. I like owning metal bikes but if I'm looking at buying something specifically to go fast on (road, track, mtb, whatever), and something to go faster on is my mental justification for buying it, it'd seem daft if I then bought something intrinsically not as good for racing on.
Ptown-
In truth, non-specific purposes.
If you want to buy a new bike, get whatever you fancy. You don't need us to tell you how to spend your entertainment budget. Don't expect to go amazingly fast just because you've lashed out a ton of cash on a new toy. On Sunday I did a 10:57 lap on my 14kg MTB on a circuit where my PB is 10:10 on a <7kg carbon road bike, and there was bovine interference on the MTB lap :-)
gbj_tester
Which performance purposes?